Read it through once

The presence of the knife on the stage of the murder was a worrying circumstance for Wilson. A week previously he had as good as admitted to himself that he believed Luigi had possessed such a knife, and that he still possessed it notwithstanding his pretense that it had been stolen. And now here was the knife, and with it the twins. Half the town had said the twins were humbugging when they claimed that they had lost their knife, and now these people were joyful, and said, "I told you so!"